Suggested Upper Merged Ontology
One of the earliest and most comprehensive foundational ontologies with thousands of terms. IEEE-owned.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Knowledge representation for AI systems
Formal reasoning and inference engines
Question answering system backends
Cross-domain semantic interoperability
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Foundational.